Picture frame



FIG. 1 is a top, front, right side perspective view of a picture frame;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top elevation view thereof;

FIG. 7 is a bottom elevation view thereof; and,

FIG. 8 is a top, rear, left side perspective view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a picture frame, as shown and described. 